Blast or exhaust fan



(No Model.)

. M; GAPELL- Kz G. s. AGBEAN.

BLAST OR EXHAUST FAN.

* No. 291,493. Patented Jan; 8, 1884'.

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GEORGE MARIE OAPELL, OFPASSENHAM, COUNTY OF NORTHAMPTON, AN D GEORGESOOUGAL MAGBEAN, OF THE GROVE BISHOPSTOKE, COUNTY OF HANTS, ENGLAND.

BLAST OR EXHAUST FAN.

SPECIFICATION forming part of Letters Patent No. 291,493, dated January 8, 1884. I Application filed April 14, 18%. (No model.) Patented in England July 3, 18852, No.3,130.

To aZZ whom it may concern: I

Be it known that we, GEORGE MAEI GA- PELL, of Passenham, in the county of Northampton, England, and GEORGE SOOUGAL 5 MACBEAN, O. 13., of The Grove Bishopstoke,

in the county of Hants, England, subjects of the Queen of Great Britain, have invented certain new and useful Improvements in the Constructionof Fans for the Purposes of Blast or Exhaust, for parts of which the said GEORGE MARIE OAPELL has received Letters Patentiu Great Britain, No. 3,130, dated July 3, 1882,

of which the following is a specification.

The invention has for its object improvements inthe construction of fans for various purposes, and the application of the principle thereof to' motors, pumps, or turbines, for the transmission of power.

Our fan consists of a hollow cylinder, of metal or wood, provided with a suitable number of internal and external curved or straight blades of metal or wood, said blades being curved after the same curve of the cylinder whereunto they are fastened, and pointing for- 2 5 ward with their convex side between said blades, further port-holes being provided as communications between the inside space of the cylinder with the outside space. As experiments have shown, it will be well to give the cylinder half the diameter of the whole fan, because, in this case, by a rapid rotation of the fan a strong suction will be caused from the inside chamber of the cylinder into the exterior space, thus adapting said fan for blast or exhausting purposes, for raising water, or for transmission of power, as turbine or motor, according to circumstances; therefore the size and shape of parts require modification. For air or gases the inlet has to be relatively large, the whole one endof the cylinder whereto the blades are attached being left open as suctionhole. As regards the outlet, it depends whether the fan is used for diffusing cool air in a building or as a regular blast device, in the first case it being left open on its whole outside circumference; but in the case of a blast-fan the fan being closed in onits circumference, with exception of the deliverypipe, which is arranged as in ordinary fans.

If the fan is used on water and fluid, the inletand the space between the interval has to be madesmall, a pipe provided with slots or holes put concentrically over the shaft answering very well in this case for inlet. In many cases it is desirable to have adjustable portholes between the inner chamber of the fan and the external space, so as to allow by the increase or' decrease of their area an increase or decrease of the suction.

In Figure l a front elevation of a blast or exhaust fan is given; Fig. 2, a central longitudinal section. Fig. 3 shows a perspective view of a fan for diffusing cool air in a building. Fig. at shows a front view of a fan separately, with adjustable port-holes; and Fig; 5, a central section through same.

Similar letters in different figures refer to corresponding parts.

Figs. 1 and 2 show an arrangement of ablastfan, the casing (Z (l, shaft 8, inlet "5, and outlet obeing arranged as in ordinary fans. The fan proper consists of the cylinder a a, whereunto the external blades, c, and the internal blades, b b b b, are fastened in a suitable manner. Between the blades port-holes are cut out in the cylinder a a, in the rear of every external blade, and forward of every internal blade. The air enters through i i, and is forced through the port-holes into the external space, and by the blades into outlet 0. r

In Fig. 3 a fan suitable for, diffusing cool air in a building is shown. No circumferen. tial cover is needed here, and pulley 1) repre sents the driving-1: ulley. Figs. 4. and 5 show the fan separately with the adjustable inter nal blades, pins Z I being fast unto the two sideplates of the external blades and moving in slots 6 e.

having thus fully described our invention, what we declare as new, and wish to secure by 0 Letters Patent, is

1. In a blast or exhaust fan, a cylinder having fastened thereto a series of internal and external blades, said cylinder being provided with. port-holes between the points where said blades are fastened, for the purpose herein set forth.

2. In a blast or exhaust fan, in combination, substantially as shown and described, I and pins 1 I, made fast to the side plates supthe cylinder a, having port-holes in the body porting the external blades, 0.-

thereofi internal curved blades, (1, external GEORGE MARIE'GAPELL. blades, 0, shafts s, and easing d. GEORGE SOOUGAL MAGBEAN. 5 3. In a blast or exhaust fan, in combination, Witnesses:

' substantially as shown and described, the JOHN DEAN,

adjustable internal blades, 1), and the cylinder WV. J. NORWOOD.

a, having slots 6 6 made in the end thereof, Both of 17 Graceclz urch Street, London. 

